Optical measurement device

Details Optical measurement device Optical measurement device

1991-01-24

1992-06-30

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

25022721, 2502311, G01B 1100

Patent

active

051257440

ABSTRACT:
An optical measuring apparatus for measuring physical quantity which has a frequency by applying an optical sensor which modulates intensity of the light according to the physical quantity, wherein malfunctions in the apparatus itself, concretely, in a condenser, an AC amplifier and a divider as well as in an optical transmitter, an optical fiber, an optical sensor, an optical receiver and a DC amplifier can be self-checked by superimposing an AC of a frequency higher than the frequency of the physical quantity on a driving current of the optical transmitter and monitoring the components of a signal of a frequency higher than a frequency of the physical quantity.

REFERENCES:
"Optical Fiber Sensor Technical Materials," The First International Corporation, pp. 310-311 Aug. 19, 1983.

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